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agent-builder
Build local-first AI agents with a single-file harness — 25 built-in tools, skills (progressive disclosure), MCP client, container sandbox, subagent decomposition, knowledge systems. Zero dependencies.
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agentsaiclaude-codegeminiharnessharness-engineeringmcpollamaopenai-codexskills
Quality signals
ActiveNo testsNo CIThin docsNo licenseNew
InstallSKILLInstall as a Claude Code skill
Universal installANY TOOL
$ npx skillcity@latest builtbyV/agent-builderAuto-detects the skill or MCP server in this repo and installs it for Claude Code, Codex, Cursor, Cline, OpenCode, Gemini CLI, Anti-Gravity, OpenClaw and Hermes.
Requires Node.js 18+ (ships with npx).
Or install manually
# Install into ~/.claude/skills/ mkdir -p ~/.claude/skills/agent-builder curl -fsSL https://raw.githubusercontent.com/builtbyV/agent-builder/main/SKILL.md -o ~/.claude/skills/agent-builder/SKILL.md
Loading README…
Ask a simulated agent to run this skill. It loads the real SKILL.md and reasons over your task with NVIDIA.
agent-builder — sandboxAI sandbox
Pick a quick prompt below or type your own — watch the agent execute this skill step by step.
guest@skillcity:~$Try a prompt